CN106590709B - The dry coke quenching technique for being prepared and being recycled based on water-gas - Google Patents
The dry coke quenching technique for being prepared and being recycled based on water-gas Download PDFInfo
- Publication number
- CN106590709B CN106590709B CN201610956981.6A CN201610956981A CN106590709B CN 106590709 B CN106590709 B CN 106590709B CN 201610956981 A CN201610956981 A CN 201610956981A CN 106590709 B CN106590709 B CN 106590709B
- Authority
- CN
- China
- Prior art keywords
- coke
- coal
- gas
- dry
- sent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Coke Industry (AREA)
Abstract
The dry coke quenching technique that the invention discloses a kind of to be prepared and be recycled based on water-gas, fluidized bed fluidisation, dry, classification are sent into after being crushed including coking coal, isolate rough coal grain and fine breeze, the rough coal grain obtains red coke after being sent into coking by coke oven, cold coke is obtained after the red burnt cooling by coke dry quenching furnace, it is characterized in that, it is described cold burnt to be sent into the wet coal rotary kiln of coke-and coking coal mixed heat transfer and coking coal is crushed, the cold coke of rotary kiln and broken rear coking coal are sent into coal-coke bolter and isolate coke out, and coking coal and coke powder are sent into the fluidized bed together after being crushed.Present invention process is simple, can effectively recovery waste heat, to coking coal efficient drying, extend service life of equipment, and soot emissions are greatly decreased, environmentally friendly and by-product gas.
Description
Technical field
The present invention relates to a kind of coal chemical technology, specifically a kind of dry coke quenching work for preparing and recycling based on water-gas
Skill.
Background technique
Dry coke quenching refers to a kind of coke quenching method of red burnt cooling down using inert gas.It is red during dry coke quenching
Coke is packed at the top of coke dry quenching furnace, and cryogenic inert gas is blasted in the red focus layer of coke dry quenching furnace cooling section by circulating fan, is absorbed red burnt aobvious
Heat, coke after cooling are discharged from coke dry quenching furnace bottom, and the high temperature inert gas come out from coke dry quenching furnace ring-shaped flue flows through dry coke quenching
Boiler carries out heat exchange, and boiler generates steam, and inert gas after cooling blasts coke dry quenching furnace, inert gas by circulating fan again
It is recycled in closed system.Dry coke quenching can improve coke strenth, reduce coke reactivity, advantageous to blast furnace operating, especially
Its large blast furnace coke stringent to quality requirement, dry coke quenching are more meaningful.
Although existing dry coke quenching technique technology maturation, reliable for operation, there is following all various problems:
(1) at 150-200 DEG C, the sensible heat containing about 0.2GJ/t- coke enters environmental loss and falls the cold burnt temperature after quenching,
Not only focusing process system belt generates thermal etching, goes back the working environment of the burnt processing region of severe exacerbation；
(2) negative pressure section can leak into a small amount of air, into after coke dry quenching furnace, O in the inert gas circulatory system2Just by red focus layer
Meeting and coke gasification reaction generate CO2, CO2It can be reduced into CO again in coke layer high-temperature region, with increasing for cycle-index, inert gas
In in CO concentration it is higher and higher.In addition, coke remaining fugitive constituent is being precipitated always, the pyrogenous origin H of coke2、CO、CH4Deng also all
It is inflammable and explosive ingredient, these are flammable group to fill into the inert gas of circulation, this with the regular part outlet of inert gas
Outlet behavior is both the waste of the energy, or the source of pollution；
(3) leakage of waste heat boiler causes the moisture in recyclegas to increase, the water that steam is generated in coke layer high-temperature region
Outlet after gas-fired, further results in energy waste；
(4) the burnt dust content of furnace roof dress is big, temperature is high, and the sensible heat that flue dust carries fails effective recycling.
On the other hand, in order to improve coking technique, coke quality is improved, binding coal dosage is expanded, to entering furnace coking
When the moisture of coal is adjusted, controls and carries out preheating and drying and dry, in addition to part waste heat of coke-oven flue gas is utilized, it is both needed to supplement
Fuel provides hot fume.Such as to the common fluidized-bed process of coking Coal pretreatment, external heat source is fuel gas in direct-combustion hot air
The high-temperature flue gas that burning generates is come into full contact with air in furnace, then by fluidized bed drying after high-temperature flue gas is mixed with Cryogenic air
Device bottom enters fluidized bed, after coking coal dry classification, then is sent by air hose to wet scrubber and is further purified by air draft
Chimney is discharged into atmosphere.This not only needs to provide the additional energy, at the same the flue gas after dry coking coal formed it is new granular material discharged
Source causes to seriously affect to environment, is one of significant contributor of PM2.5.
Summary of the invention
The purpose of the present invention is to solve above-mentioned technical problem, a kind of simple process is provided, can effectively be recycled more than low temperature
Heat, by-product gas, to coking coal efficient drying, extend and service life of equipment and soot emissions be greatly decreased, it is environment amenable
The dry coke quenching technique for being prepared and being recycled based on water-gas.
In present invention process, including it is broken after coking coal be sent into fluidized bed fluidisation, dry, classification, isolate rough coal grain and
Fine breeze, the rough coal grain obtain red coke after being sent into coking by coke oven, obtain cold coke, the cold coke after the red burnt cooling by coke dry quenching furnace
It is sent into the wet coal rotary kiln of coke-and coking coal mixed heat transfer and coking coal is crushed, out rotary kiln cold burnt and after being crushed
Coking coal is sent into coal-coke bolter and isolates cold coke, and broken rear coking coal and coke powder are sent into the fluidized bed together.
Cooling gas in the coke dry quenching furnace is circulating gas, and it is exhausted to enter waste heat boiler recycling for the circulating gas of coke dry quenching furnace out
Most of sensible heat, be re-fed into fluidized bed coking coal after broken is fluidized, dried recovered low temperature exhaust heat, while taking coking coal out of
In partial moisture, coke dry quenching furnace is transmitted back to after expansion chamber or cyclone dust collectors dedusting, red coke is carried out to cool down concurrent unboiled water coal gas
Reaction generates water-gas and enters in circulating gas, reacts the water-gas of generation and draws that be sent to coal gas net as byproduct residual gas
Change system.
The coke oven flue gas from coke oven horizontal flue is introduced in the wet coal rotary kiln of coke-coking coal is dried simultaneously
Steam in band kiln discharge.
It is being taken out of with circulating gas and obtain fine coal and fine powder coke after expansion chamber or cyclone dust collectors dedusting and be sent into blast furnace
Moulded coal is made in blowing coal-hole or pressure ball system.
By controlling the cold Jiao Wendu being discharged by coke dry quenching furnace, to adjust out the water content of the wet coal rotary kiln coking coal of coke-,
And then control out the water content of fluidized bed coking coal.
Cold burnt temperature by controlling out coke dry quenching furnace discharge is greater than 200 DEG C, and preferably more than 250 DEG C, to adjust out coke-
The coking coal water content of wet coal rotary kiln drops to 5-6wt%, and then controls out water content in the coking coal after fluidized bed drying
Drop to 3wt% or less.
The dusty gas of the burnt flue dust of the dress of the coke dry quenching furnace Base top contact, blast furnace blowing coal-hole or pressure ball system is through the detonation that disappears
Burner is burnt after the burnt dirt of oxygen depleted and part, is sent with the coke oven flue gas from coke oven horizontal flue together as dried medium
Enter the wet coal rotary kiln of coke-.
Inventor furthers investigate the drying process and Dry Quenching Technology of existing coking coal, has made following improvement:
(1) quenching medium of original inert gas as dry quenching system is substituted using circulating gas, while also changes circulation coal
The circulation route of gas, broken coking coal is dried in the coal gas of dry quenching system out, obtains the waste heat in circulating gas
To effective recycling；The thermal energy in circulating gas is recycled by two steps, loopback enters the temperature meeting of the circulating gas of dry quenching system
100 DEG C -110 DEG C are down to, to further improve the heat exchange efficiency of coke dry quenching furnace.(2) circulating gas is sent into fluidized bed to broken
Coking coal afterwards is dried, and drying efficiency and efficiency can be improved, and the ash-laden gas of generation is recycled into dry put out after dedusting
It exchanges heat in burnt system, there is no the problem of flue gas emission, thoroughly solve the emission problem of PM2.5, to environment after fluidized bed out
It is friendly；(3) although there are reactions various in the dry quenching system described in background technique to lead to the CO (H also contained2、CO、CH4Deng)
Quenching medium has been changed to circulating gas, this technical problem by inert gas due to inventor's creativeness by the problem of accumulation
Just become beneficial technical effect；Additionally, due to the circulation route for changing circulating gas, circulating gas is in a fluidized bed
When dry, the moisture content in coking coal can be taken out of, these moisture enter after dry quenching system with circulating gas to react with red coke
Water-gas is formed, so that circulating gas amount is on the basis of meeting circulation route demand, moreover it is possible to generate surplus gas conduct
Byproduct extraction system, produces additional economic benefit, and thermal energy, smoke dust discharge, energy conservation are sufficiently recycled in entire cyclic process
It lowers consumption, is environmentally friendly.Also, the reaction process of above-mentioned water-gas is an endothermic process, is also beneficial in dry quenching system
Quick quenching.(4) 3% is down to hereinafter, inventor can be by controlling out waste heat boiler in order to effectively control the water content of coal
The temperature of circulating gas, is conducive to the dry tenacity for improving fluidized bed, the water content that goes out coking coal in fluidized bed reduce by 3% with
Under, it is even lower.(5) it when the water in circulating gas enters dry quenching system, can react with coke, according to gas-solid reaction
Mechanism, the fine coke breeze of coke surface can preferentially occur water gas reaction, i.e., preferentially consume the fine dusts of coke surface, thus
Coke quality is improved, fine powder coke content is reduced, improves product quality.(6) cold coke is introduced into rotary kiln and coking coal
Mixing, effect have three, a) carry out convection drying to coking coal using cold burnt waste heat, cold coke waste heat recovery efficiency is high；B) using cold
The burnt particle feature high compared with coking coal intensity is crushed coking coal in rotary kiln；C) the coke powder adsorption ability of Leng Jiaozhong compared with
By force, its surface can absorbed portion coal dust, be conducive to improve coking coal performance, and then improve coke property；D) in rotary kiln
Phase mutual friction and collision between interior coke button and coking coal, coke button and coke button, the crackle of bulk coke crack in advance, and intensity is lower
Coke button fall off in advance, the corner angle of coke button are denuded in advance, improve the mechanical stability of metallurgical coke, and lumpiness is in 70mm or more
Bulk coke reduce, and the middle block of 25~75mm coke accordingly increase, the uniformity of coke lumpiness is improved.
Further, fill that burnt flue dust dustiness is big, temperature is high for furnace roof, the sensible heat that flue dust carries fails effectively to recycle benefit
With the problem of, this part flue dust is sent by inventor disappear the burnt dirt of quick-fried burner combustion oxygen depleted and part after, and come from
The coke oven flue gas of coke oven horizontal flue is sent into the wet coal rotary kiln of coke-together as dried medium, so that this part of flue dust
Waste heat also obtains effective recycling.
Present invention process is simple, reduces the cold Jiao Wendu of coke dry quenching furnace discharge, recycles cold burnt sensible heat about 0.1GJ/t- coke more,
Also the cold burnt thermal etching to travelling belt is accordingly slowed down, along the service life for having grown belt；Creative has used circulating gas to replace
Original inert gas is changed, the discharge of PM2.5 is reduced, further recovery waste heat 0.4GJ/t- goes back by-product coal while burnt above
Gas improves coke quality, environmentally friendly；The broken and dry of coking coal is realized by the way that the wet coal rotary kiln of coke-is synchronous, is mentioned
The high drying effect and efficiency of coking coal, coal water content be down to 3% hereinafter, dry thermal energy from system hypothermia waste heat, into one
What is walked is energy-saving.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
Explanation is further explained to present invention process with reference to the accompanying drawing: by coking coal (water content 10wt%) through broken
Machine is rough and torn to be broken to 40mm hereinafter, cold burnt together through coal-coke batch hopper feeding coke-greater than 200 DEG C with coke dry quenching furnace discharge again
In wet coal rotary kiln, cold coke waste heat dries coking coal, while coking coal being made to be crushed (being crushed to 3mm or less), synchronizes benefit
It is dried with the coke oven flue gas from coke oven horizontal flue, the water content of coking coal is made to drop to 5-6wt%, the wet cigarette of discharge
Gas enters qualified discharge after deduster dedusting, and the cold coke of the wet coal rotary kiln of coke-enters coal-coke with coking coal and separates screening out
Temperature is separated out lower than 100 DEG C of cold cokes, broken rear coking coal and coke powder are sent into fluidized bed together and are fluidized, dried, is classified, quilt
Circulating gas is dry to water content 3wt% hereinafter, and being classified and obtaining rough coal grain (partial size 0.3-3mm) and fine breeze (partial size <
0.3mm), the rough coal grain obtains red coke after being sent into coking by coke oven, and red burnt be sent into after coke dry quenching furnace is cooled down by circulating gas obtains temperature
Degree is greater than 200 DEG C of cold coke；The circulating gas (900 DEG C of temperature) of coke dry quenching furnace enters waste heat boiler byproduct steam out, out waste heat pot
The circulating gas (180-230 DEG C of temperature) of furnace is sent into fluidized bed to coking coal fluidisation, dry, classification after broken, out fluidized bed
For circulating gas after expansion chamber or cyclone dust collectors dedusting, most of loopback coke dry quenching furnace draws red burnt progress quenching, fraction
Gas cleaning system is sent into as by-product gas.The fine coal (partial size < 0.3mm) isolated through expansion chamber or whirlwind dust settler is sent
Enter blast furnace blowing coal-hole or pressure ball system.
The dress coke flue dust of the coke dry quenching furnace Base top contact disappeared after the burnt dirt of quick-fried burner combustion oxygen depleted and part and
Coke oven flue gas from coke oven horizontal flue is sent into the wet coal rotary kiln of coke-together as dried medium and takes away moisture in kiln.
For producing the 6m coke oven production in 55 hole of burnt 1,100,000 tons of burnt 2 per year, after present invention process, add up to recycling
It is more than waste heat about 0.4GJ/t- coke, by-product gas 10000m3/ hour；Coking coal into water content before coke oven be down to 3% hereinafter,
Reduce by 7% or more coking wastewater yield.
Claims (6)
1. a kind of dry coke quenching technique for being prepared and being recycled based on water-gas, including broken rear coking coal are sent into fluidized bed fluidisation, are done
Rough coal grain and fine breeze are isolated in dry, classification, and the rough coal grain obtains red coke after being sent into coking by coke oven, and red coke passes through coke dry quenching furnace
Cold coke is obtained after cooling, which is characterized in that the cold burnt wet coal rotary kiln of coke-of being sent into is with coking coal mixed heat transfer and to coking
Coal is crushed, and the cold burnt and broken rear coking coal of rotary kiln is sent into coal-coke bolter and isolates cold coke out, coking after being crushed
Coal and coke powder are sent into the fluidized bed together；Cooling gas in the coke dry quenching furnace is circulating gas, out the circulation coal of coke dry quenching furnace
Gas enters waste heat boiler and recycles most sensible heats, be re-fed into fluidized bed coking coal after broken is fluidized, dried recovered it is low
Warm waste heat, while taking the partial moisture in coking coal out of, coke dry quenching furnace is transmitted back to red after expansion chamber or cyclone dust collectors dedusting
Coke carries out cooling water gas reaction generation water-gas of concurrently giving birth to and enters in circulating gas, reacts the water-gas of generation as byproduct
Gas cleaning system is sent in residual gas extraction.
2. the dry coke quenching technique for preparing and recycling based on water-gas as described in claim 1, which is characterized in that the coke-
The coke oven flue gas from coke oven horizontal flue is introduced in wet coal rotary kiln coking coal to be dried and with steam in kiln discharge.
3. the dry coke quenching technique for preparing and recycling based on water-gas as described in claim 1, which is characterized in that with circulating gas
It is taking out of and obtain fine coal and fine powder coke after expansion chamber or cyclone dust collectors dedusting and be sent into pressure ball system or blast furnace blowing coal-hole.
4. the dry coke quenching technique for preparing and recycling based on water-gas as described in claim 1, which is characterized in that by control by
The cold Jiao Wendu of coke dry quenching furnace discharge to adjust out the water content of the wet coal rotary kiln coking coal of coke-, and then controls out fluidized bed refining
The water content of coking coal.
5. the dry coke quenching technique for preparing and recycling based on water-gas as claimed in claim 4, which is characterized in that by controlling out
The cold burnt temperature of coke dry quenching furnace discharge is greater than 200 DEG C, and the coking coal water content of the wet coal rotary kiln of coke-is adjusted out less than 250 DEG C
5-6wt% is dropped to, and then controls out water content in the coking coal after fluidized bed drying and drops to 3wt% or less.
6. the dry coke quenching technique as claimed in claim 1 or 3 for preparing and recycling based on water-gas, which is characterized in that described dry
The dusty gas quick-fried burner combustion that disappeared for putting out the burnt flue dust of dress of furnace Base top contact, blast furnace blowing coal-hole or pressure ball system consumes
After the burnt dirt of oxygen and part, the wet coal of coke-is sent into together as dried medium with the coke oven flue gas from coke oven horizontal flue and is returned
Rotary kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610956981.6A CN106590709B (en) | 2016-10-27 | 2016-10-27 | The dry coke quenching technique for being prepared and being recycled based on water-gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610956981.6A CN106590709B (en) | 2016-10-27 | 2016-10-27 | The dry coke quenching technique for being prepared and being recycled based on water-gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106590709A CN106590709A (en) | 2017-04-26 |
| CN106590709B true CN106590709B (en) | 2019-06-18 |
Family
ID=58590552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610956981.6A Active CN106590709B (en) | 2016-10-27 | 2016-10-27 | The dry coke quenching technique for being prepared and being recycled based on water-gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106590709B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608125A (en) * | 2009-07-09 | 2009-12-23 | 神华集团有限责任公司 | A kind of method for upgrading coal pyrolysis |
| CN103421521A (en) * | 2013-08-07 | 2013-12-04 | 陕西煤业化工技术研究院有限责任公司 | Device and method for preparing pulverized coal with low energy consumption |
| TW201400601A (en) * | 2012-06-25 | 2014-01-01 | Thyssenkrupp Uhde Gmbh | Method and device for improved preheating of coal by heat exchange with cooling gas from a coke dry cooling facility |
| CN104662136A (en) * | 2012-07-20 | 2015-05-27 | 新日铁住金株式会社 | Coal upgrading method and coal upgrading device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58132078A (en) * | 1982-02-01 | 1983-08-06 | Mitsubishi Heavy Ind Ltd | Method for drying coal |
| JP2006335956A (en) * | 2005-06-03 | 2006-12-14 | Sumitomo Metal Ind Ltd | Method of recovering surplus offgas in coke dry quenching equipment |
-
2016
- 2016-10-27 CN CN201610956981.6A patent/CN106590709B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608125A (en) * | 2009-07-09 | 2009-12-23 | 神华集团有限责任公司 | A kind of method for upgrading coal pyrolysis |
| TW201400601A (en) * | 2012-06-25 | 2014-01-01 | Thyssenkrupp Uhde Gmbh | Method and device for improved preheating of coal by heat exchange with cooling gas from a coke dry cooling facility |
| CN104662136A (en) * | 2012-07-20 | 2015-05-27 | 新日铁住金株式会社 | Coal upgrading method and coal upgrading device |
| CN103421521A (en) * | 2013-08-07 | 2013-12-04 | 陕西煤业化工技术研究院有限责任公司 | Device and method for preparing pulverized coal with low energy consumption |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106590709A (en) | 2017-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101812310A (en) | High-efficiency lignite low-temperature dry distillation quality-enhancing process by using dry distillation coal gas as heat-carrying medium | |
| CN102384664A (en) | Sintering and cooling integrated method for efficiently recovering and utilizing waste heat resources and device thereof | |
| CN106675601B (en) | Dry quenching circulating gas and coke oven flue gas waste heat coupling utilization method | |
| CN106635069B (en) | A kind of dry quenching system recyclegas low temperature heat method | |
| CN105713629B (en) | A kind of steam thermal coupling pulverized coal pyrolysis method | |
| CN104830353A (en) | Dry-wet-combined coke quenching method | |
| CN106520158B (en) | Based on the pretreated coke oven output medium residual-heat utilization method of coking coal | |
| CN106590709B (en) | The dry coke quenching technique for being prepared and being recycled based on water-gas | |
| CN107964411A (en) | Dry coke quenching coke breeze reflux coking coal method | |
| CN106566569B (en) | Dry Quenching based on coal damping, which synchronizes, prepares water gas system | |
| CN106554787B (en) | Cold burnt residual-heat utilization method is put out based on the dry of heat storage is moved | |
| CN106479543B (en) | The cold burnt broken coking coal pretreating process to dry is put out based on dry | |
| CN106590700B (en) | A kind of dry coke quenching unit residual heat and energy utilization system | |
| CN102409128A (en) | Device and process for making gas and reducing iron through coal derived fusion melting bed | |
| CN110184405A (en) | A kind of method and device thereof using acid carbonaceous metallized pellet production molten iron | |
| CN106566568B (en) | A kind of dry quenching system residual heat and energy method of comprehensive utilization | |
| CN106635070B (en) | One kind is dry to put out cold burnt low temperature heat and rough and torn integral process | |
| CN106520148B (en) | Water-gas preparation system based on Dry Quenching | |
| JP2013234299A (en) | Method of manufacturing palm kernel shell charcoal | |
| CN106352711B (en) | Coking process residual heat and energy utilization system | |
| CN107089661B (en) | A kind of calcium focal sphere group classification oxygen thermal method produces calcium carbide production technology | |
| CN106222447B (en) | A kind of pyrolysis of fume afterheat furnace interior recycling type lateritic nickel ore dry bulb group and reduction reaction system and method | |
| CN106222448B (en) | A kind of pyrolysis of fume afterheat furnace interior recycling type lateritic nickel ore wet bulb group and reduction reaction system and method | |
| CN105623740B (en) | Clean coal gas preparation and preparation system | |
| CN206787171U (en) | A kind of device of lignite step upgrading |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20170629 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Applicant after: Wuhan iron and Steel Company Limited Address before: 430083 Qingshan District, Hubei, Wuhan Applicant before: WUHAN IRON AND STEEL CORPORATION |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |